DE2403713A1 - HEAT EXCHANGER - Google Patents

Description

description
to the patent application

of the company INTERNATIONAL COMBUSTION LIMITED Nineteen Woburn Place, London, WClH ONA / England

concerning:

"Heat exchanger"

The invention relates to heat exchangers and, more particularly, to heat exchangers for the quenching cooling of gases.

According to the invention is a heat exchanger for cooling a fluid with a fluid between an inlet and an outlet leading the line, which on at least one Part of its length is enclosed by a double coolant channel, which has a first section for guiding the coolant to the fluid inlet, a coolant flow reverser and a second coolant channel section between the first and fluid conduits, characterized by a protective device to protect at least the reversing device against the full operating temperature of the fluid to be cooled.

The protective device for the training

generation of stagnant fluid conditions in the area of the reversing device educated. - '

409832/0346

Preferably, the protective device also includes thermal insulating material.

With reference to the accompanying drawing, a preferred embodiment for a heat exchanger according to FIG of the invention will be described. The drawing represents a sectional side view.

According to the drawing, the heat exchanger comprises a plurality of parallel units, only one of which is shown. Each unit comprises a central duct 2 for the upward flow of a hot gas to be extinguished in a single pass. The gas flows from a lower hot gas region 1 near one Gas partition 3 in an upper area 5 * which is partially limited is through an upper tube plate 14. The gas partition 3 separates the Medicinal gas area 1, which has a refractory lining 2o, from an area 21, which although under the same pressure as the hot gas stands, but is stagnant and much cooler.

A double coolant channel surrounds each conduit 2. It has inner and outer annular channel sections 6 and 12, respectively, between three concentric cylindrical tubes J ₃ 8, 13. The inner surface of the innermost tube 7 defines the conduit 2. At its lower ends, the innermost and the outermost tube 7 or I3 are connected to one another by a semi-toroidal connecting ring 17. At the upper end, the inner coolant channel section 6 opens into a common outlet header between the upper one Tube plate 14 and a tube plate Io, the collector being provided with an outlet pipe socket 15. In a similar way, the outer coolant channel section 12 opens into an inlet header between the tube plate Io and a tube plate 9 *, this header also having an inlet pipe stub 11. In order to improve the strength and to enable a reduction in the thickness of the tube plates 9 and 14, a number of tie rods 16 are used, only one of which is shown here. Since the tube plate Io only serves to reduce the pressure difference between the coolant inlet header

- 3 409832/0346

and outlet manifolds, it can be a proportionate have a thin cross-section.

In order to accommodate the thermal expansion of the tubes 7, 8, 13 relative to the gas partition 3, a short pipe stub 4 is positioned axially in the gas partition 3, but loosely with respect to lateral displacements; the pipe stub 4 protrudes slidably into the pipe 7. The pipe stub 4, the connecting ring 17 and the upstream end of the pipe Ij5 are surrounded by Tose-packed thermally insulating fiber material 18 which is embedded between the gas partition 3 and a holder 19. Just like the pipe stub 4, the insulation 18 and the holder 19 also do not exert any tensile or compressive forces on the pipes J, 8 and 13, which are only supported by the pipe plates 14, Io and 9, respectively. The insulation 18 is used; to reduce the heat transfer from the hot gas area 1 to the cooler, stagnant area 21. Because of the cooler, stagnant conditions above the gas partition 3 and because of the cooling effect of the coolant between the tubes 13 and 8, the welds between the connecting ring 17 and the tubes 13 and 7 and between the tube I3 and the tube plate 9 are against the full temperature of the gas protected in the hot gas area 1. In addition, the thermal movements during start-up or shutdown are easily absorbed because of the way in which the tubes 7 and 8 and I3 are only suspended at one end. Differential thermal movements of the tubes 7 and I3 are absorbed by the rolling of the connecting ring 17.

When the heat exchanger is in operation, cooling water flows downward through the channel section 12, through the connecting ring I7 deflected and then flows upwards through the channel section 6, wherein the gas in the middle line 2 heat is extracted. Man accordingly recognizes that the tube plates 9, Io and 14 and accordingly their connections to tubes I3, 8 and 7 are also located at the cooler end of the heat exchanger.

- 4 409832 / Ü346

You can also see that thanks to the fact that the central Line 4 is straight and a substantially uniform one Has cross-section and only has a single passage, which makes cleaning much easier; this is special Advantage if the heat exchanger is used to extinguish gases which carry solid particles with them.

In another (not shown) embodiment, the tube IJ contains a bellows to provide the ability to equalize different thermal movements to increase further.

- patent claims -

409832/0346

Claims (8)

- Claims _ £ H U O / I O Heat exchanger for cooling a fluid with a line leading the fluid between an inlet and an outlet, which is enclosed at least over part of its length by a double coolant channel which has a first section for the Guiding the coolant to the fluid inlet, a coolant flow reverser and a second coolant channel section between the first and fluid conduits, characterized by a protective device for protecting at least the reversing device against the full operating temperature of the fluid to be cooled. 2. Heat exchanger according to claim 1, characterized in that the protective device is designed for the formation of stagnant fluid conditions in the area of the reversing device. 3>. Heat exchanger according to claim 2, characterized in that the protective device comprises a partition wall which extends over an area containing fluid to be cooled. 4. Heat exchanger according to claim J5, characterized in that the partition wall is lined with thermally insulating material. 5. Heat exchanger according to claim J5 or 4, characterized in that that the partition is designed and arranged with play relative to the fluid line or the coolant channel. 6. Heat exchanger according to claim 5 *, characterized in that a pipe stump is loosely held by the partition and slidably protrudes into the fluid line. 7. Heat exchanger according to one or more of the preceding claims, characterized in that the coolant channel between three tubes arranged one inside the other are formed, the innermost of which forms at least part of the fluid line. - 2 409832/0346 8. Heat exchanger according to claim Y, characterized in that the three tubes each end at an associated tube plate which are arranged at an axial distance from one another and the outer tubes are connected to one another by tie rods. 409832/0346